And to land on Mars you need both, ideally. The athmosphere is too thin to rely on just aerobreaking and the other would use much more propulsion.

Did you know that those annoying MOBO software come not from windows update but by the UEFI/BIOS boot process injecting it into your windows installation? Yeah, just like some rootkit shenanigans, still, this is a windows “feature”. (Windows platform binary table) You can turn it off usually, but OFC by default it’s enabled.